Research Of Optimization Of Broadband Drectional Antenna Design And Measurement Method

As the development of communication technology, in the modern communication system antenna plays an indispensable role, and wireless communication system is used more widely. At the same time, the electromagnetic field of traditional circuit theory and also new challenges. It has been begun to explore new theories to solve new problems faced by, such as the transient time-domain electromagnetics, ultra-wideband electromagnetics, computational electromagnetics, probability theory. Of wireless communication antenna system performance is essential to a higher demand, mainly reflected in a wider frequency band, a smaller, easy to install and carry, at the same time with high radiation efficiency in this area many difficult issues that need to be solved. Internal directional antenna for broadband is still in the research stage of development. In this paper, monopole antenna in the wafer on the basis of these broadband directional antenna's impedance characteristics and radiation effects have been studied to be a clear and effective to quantify the results. The results show that these antennas have a very wide bandwidth, good impedance characteristics, a strong direction. Oscillator feed wafer flat reflector antenna surface in the pitch with a wide beam, while the scope of the beam to achieve a good linear polarization and circular polarization properties; wafer oscillator of the parabolic antenna feed can be achieved high-gain directional radiation and receive functions. These new broadband monopole antenna for a directional antenna to improve effective, can significantly broaden the antenna beam, to achieve high-gain directional characteristics, theoretical analysis and simulation of the design of broadband directional antenna technology simulation performance.The main work is carried out around the antenna of a broadband directional antenna theory analysis and simulation to optimize the design, further summed up the design of broadband directional antenna design methods and experience. In the course of the wafer into a monopole antenna can be used by the computer algorithm. Ansoft HFSS application software for broadband directional antenna simulation, simulation results based on theoretical analysis. The main contents of the following sub-sections:(1) the basic mathematical model of an antenna, absorbing boundary conditions, solve the problem of stability and numerical dispersion.(2) analysis of broadband directional antenna, this article from the antenna structure, frequency-domain characteristics and impedance characteristics, etc. of their analysis and discussion, summed up the design of broadband directional antenna ideas and techniques.(3) broadband directional antenna of the theoretical analysis, simulation to optimize the design and testing, this paper through theoretical analysis, the basic model of the antenna, and then to the antenna design is optimized. Finally, the antenna has been tested, to be a good test results, in good agreement with theoretical results.(4) analysis of broadband directional antenna parameters on its performance. Broadband directional antenna as a result of the many geometric parameters, each parameter can be a direct impact on the antenna radiation performance, detailed analysis of this paper, the parameters on the antenna performance for the design of broadband directional antenna provides an important reference.In this paper, "Broadband directional antenna of the research and simulation," the subject of broadband development in the history of directional antenna, broadband directional antenna theory and design of broadband directional antenna to do a more detailed study. Broadband directional antenna in accordance with the requirements of the indicator, in the wafer based on the monopole antenna, broadband at home and abroad and the development of directional antenna and the actual application of the broadband directional antenna design is optimized. In this paper, the wafer under study is a small monopole antenna, and feed the broadband directional antenna simple. This antenna not only has a wide impedance bandwidth, but also has a stable phase center. This makes broadband directional antenna wafer unipolar distortion can send and receive short-pulse time-domain signal. Therefore, the antenna is not only applicable to broadband communications, but also can work as a complex multi-frequency antenna system of a single transceiver. According to the results of the final design of broadband directional antenna, as well as the simulation analysis, we can be satisfied with the performance indicators, the achievement of broadband technology and the direction of the request in good agreement with the theoretical analysis.